When Moses revealed to the people of Israel the means by which they would be redeemed from the slavery of Egypt, the people bowed their heads and worshipped. It was by means of the sacrifice of the Passover lamb, and the display of the blood upon the door posts of their houses. Otherwise, the death angel would pass through all the land and kill all the firstborn, man and beast. Israel was an idolatrous and sinful people, as were the Egyptians. God's wrath against the entire land would have punished them all, but for the substitute lamb, whose blood displayed was a sign, that the sins of Israel had been paid for in the blood of an innocent victim slain in their place. This was a clear example of substitution, the death of a lamb in the place of poor sinners. It points to the Lamb of God, Who one day would die in the place of His people, and for our sins. Rather than being judged by God for our sins, God would judge His Dear Son as our surety, our savior, Who gave His life a ransom for us. All this raises the question, why did Israel so quickly rebel against God? It was right after God had made a covenant with Israel, and given it the law, that the people made a golden calf to worship at the foot of Mount Sinai! Their worship was debauched, and God's wrath was kindled against them. Why didn't the Passover sacrifice, and all the other animals slain as offerings for sin, change the hearts of the people away from rebellion against their God, Who had rescued them from slavery and oppression? Still today, the Passover is celebrated by the Jewish people, yet they are not saved, yet they are not faithful to God at all.